id,summary,reporter,owner,description,type,status,priority,milestone,component,version,resolution,keywords,cc,os,architecture,failure,testcase,blockedby,blocking,related,differential
2191,A way to programmatically cause GHC to report the cost center stack associated with a value,SamB,simonmar,"I find that I often wish I could ask GHC to tell me ""where did *that* value come from?"" as I debug JHC. Since GHC obviously can track this information, it seems like it would be fairly simple to implement a way for it to report this information as instructed by a running program. Perhaps:
reportCssFor :: a -> b -> b
I wouldn't really have any desire to use this on thunks, since when I want to do this it is usually because I don't like the value (i.e. it isn't in the right normal form), and to know this I must already have evaluated it.",feature request,closed,normal,6.12 branch,Profiling,6.8.2,fixed,patch,chevalier@…,Unknown/Multiple,Unknown/Multiple,,,,,,